Pontoon



A ril 6, 1926.

P. G. ZIMMERMANN ET AL PONTOON 2 Sheets-Sheet Filed July 11, 1923 qqqpp000300000300ovaooaoocoooa M INVENTOR- April -6 1926. 1.579306 P. G. ZIMMERMANN ET AL PONTOON Filed July 11 1923 2 sheetsxsheet fiwz ATTORNEKAI Patented Apr. 6,1926.

' UNITED STATES.

PATENT orrlce.

PAUL G. ZIMMEBMANN AnnBoRIs v. KoRvrN KRoUxovsxY, or KE YPQRT, NEW sna- SEY, ASSIG-NORS TO AEROMABINEFPLANE &

is. Y., A conrorwrron or NEW YORK.

moron. COMPANY, 01?- new YORK,

ron'rooN.

Application filed July 11',

To. all whom. it tray concern: 1

Be it known that we, PAUL G.' Z'IMMER- MANN and Boms V. Konvm-Knouxovsn'r,

citizens, respectively, of. the United States :of-

America and of Russia, and both residents of Keyport, in the coimty of Monmouth and over prior constructions, in which it has been necessary to operate on the inside through a small opening. Our construction is a sectional one, riveted Whollyon the out-- side in such manner as to form an effective tight joint.

In the accoinpahyingdrawings forming part hereof:

Fig. 1 is a separated side view of the parts in readiness for assembling; and

Fig. 2 is a cross-section on the line 2*2 of Fig. l.

As seen in Fig. 1, the pontoon comprises two longitudinal sheet-metal half sections 2, and a central vertical diaphragm 3. Each of the sections 2 is made in an appropriate manner of a suitable number of pieces, braced internally by ribs 4, and ex-,

tending. around the full circuit of the edge is anexternal flange 5, lying adjacent the. central vertical plane. These flanges are perforated at short intervals by rivet-holes. (3 arranged in a line extending continuously all the way around the margin of thesection.

Each section has also,.at the top, projecting halves 7 of'two hollow struts spaced fore and aft of the pontoon. 'The completed strut seen in Fig. 2 is zmarked -70. These struthalves are likewise formed with outturned meeting flanges 50.

The diaphragmis made larger than the interior of the pontoon and its marginal portion lies between the flanges 5 and is perforated with a similar line of rivet holes 60. It is likewise formed with vertical ex- 1923. Serial No. 650.711.

tensions 71 corresponding the positions of the strut halves 7, to .form central webs in the struts. Ribs 8 are united in vertical position to the opposite faces of the dia phragin. V

The half sections and the diaphragm are put together, and the edges are enclosed by a metal -U-strip or clamp 9, also perforated for rivets. The parts are then united to form a closed water-tight float by-rivets 10 passed through the composite external fin, the'constructionbeing such that a tight joint is obtained by a single line-of rivets, owing to the circuitous that water would ave to follow to gainentranceto the interior. ,Impregnated textile strips 11 may be laid between the flanges and the U-piece 9.

ath between the faces Socket pieces" 12 inserted into the ends of the struts serve for fastening to fitt ngs on the under side of the wing.

ferred construction, which, it will be understood, may be modified in detail.

What we claim as new is:

-1. A pontoon constructed of sheet-metal half sections with external flanges extending the full circuit of their edges, and a central diaphragm heldat its margin between said flanges, the flanges and marginal por tion of the diaphragm being incorporated into a tightriveted joint, substantially as describe 1 2. A wingtip pontoon constructed of sheet-metal half sections with external flanges and halves of upwardly projecting To This completes a description of the pre-- hollowv struts, and an externally riveted tight joint including the flanges..-

In etal half sections with external flanges and halves of upwardly projecting hollow struts, a central diaphragm held at its marginbetween' said flanges and having extensions lying between the halves of the struts, and an externally riveted tight joint including the flanges and the marginof the diaphragrn.-

-' PAUL e. ZIMMERMANN.

BORIS V. KOBVIN-KROUKOVSKY.

3. A wing tip pontoon comprising shet- 

